Rear surface of a power supply



FIG. 1 is a rear perspective view of the rear surface of a power supply of the present invention;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a top elevational view thereof;

FIG. 6 is a bottom elevational view thereof; and,

FIG. 7 is a front perspective view thereof.

The phantom lining throughout the drawing figures is included for the purpose of illustrating the power supply housing only and forms no part of the claimed design. 

The ornamental design for the rear surface of a power supply, as shown and described. 